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Coelomic Organs.—The chief point of interest about the splanchnocoele or perivisceral cavity is that in the Myxinoids the adult shows a persistent embryonic condition in that the pericardiac portion never becomes isolated from the main body cavity.

Schizocœle, skiz′ō-sēl, n. a term applied to the perivisceral cavity of the Invertebrata, when formed by a splitting of the mesoblast.—adj.

Perienteron, per-i-en′te-ron, n. the primitive perivisceral cavity.—adj.

Perivisceral, per-i-vis′e-ral, adj. surrounding viscera.

With regard to this ventral portion of the coelom in Vertebrata, it is to be noticed that the cavity in it never becomes divided up, but always remains continuous, forming the perivisceral portion of the coelom.